软土地层临近地铁基坑施工影响控制研究

随着城市地铁沿线地下空间的持续开发,基坑施工对临近地铁变形影响控制越来越受到关注。以上海某邻近地铁的基坑工程为例,通过实测分析和数值计算的方法研究了基坑开挖和拆撑对临近隧道变形的影响,并对伺服系统控制临近隧道变形进行定量分析。结果表明:覆存于软土地层中的隧道对临近施工扰动非常敏感,尽管大区基坑与隧道间距超过2.5倍开挖深度,隧道变形仍超过了监护要求的控制值;大区地下结构施工时拆撑对隧道收敛变形影响超过开挖影响的50%;应力伺服支撑系统对控制临近隧道变形比较有效,适当的“负位移”可以对隧道变形产生有利效果。

Global Scientific Trends in Research Related to Diabetic Sarcopenia from 1993 to 2023: A Bibliometric Analysis

Objectives: In this study, bibliometric approach was used to explore the literature in the field of research related to Diabetic Myasthenia Gravis in order to identify the current research progress in Diabetic Myasthenia Gravis related research and to help the researchers to predict the future hotspots in the field of research and to provide reference for the research. Methods: Literature related to diabetic sarcopenia published from 1993 to 2023 since the inception of the repository was extracted from the Web of Science Core Collection (WoSCC) and bibliometric analyses were performed. We have analysed the published literature of the last approximately almost 30 years, as well as publication and citation analyses from different countries, institutions, journals and authors. For keywords, we performed co-occurrence, clustering, timeline view and citation burst analysis. Results: On the basis of 1564 publications, we found a continuous increase in the number of publications and citations, especially in the last six years. The United States is the most representative country, and Seoul National University (SNU) is the most representative institution. The most popular journal in the field is Diabetes Care;Fukui, Michiaki is the most prolific author, leading many studies related to diabetic sarcopenia. The most frequently cited reference was a revised European consensus on the definition and diagnosis of sarcopenia;the most cited keywords were related to physiological factors of diabetes, sarcopenia and related conditions, such as “insulin resistance”, “skeletal muscle”, “body composition”, “risk” and “prevalence”. Conclusion: With more and more studies on the relationship between diabetic sarcopenia, this study presents the current status and trend of research related to diabetic sarcopenia over the past nearly 30 years through the visualization software CiteSpace. It can help researchers identify potential collaborators and partner institutions, hotspots and research frontiers in the field of diabetic sarcopenia. However, our work is only based on the English language literature in the WoSCC database, and for future studies, we recommend that researchers explore the literature from multiple databases to enhance the scope of their research.

基于多目标灰狼优化算法与RBF神经网络的真空灭弧室触头结构优化设计

在真空灭弧室触头开断过程中,合适的磁场分布有利于提高其开断性能;在合闸过程中,动、静触头间存在的电动斥力会导致触头出现弹跳现象。针对以上问题,首先建立了带铁芯式杯状纵磁触头的三维模型,进行了磁场分布与电动力的计算;为了进一步提高触头的性能,然后构建了以触头片开槽长度、开槽宽度、径向偏转角度、杯座斜槽高度及单个斜槽上下旋转角度为输入,电流峰值时刻触头间隙中心平面纵向磁场强度最大值、过零时刻中心点处磁滞时间、合闸时动静触头间的电动斥力分别为输出的RBF神经网络模型;最后结合RBF神经网络模型与多目标灰狼优化算法(MOGWO)对触头结构进行了优化。结果表明:与初始结构参数相比,当触头片开槽长度为19.74mm、宽度为3.94mm、径向偏转角为19.9°、杯座斜槽高度为18.0mm、斜槽上下旋转角为119.2°时,触头具有更好的磁场分布特性,且动、静触头间的电动斥力明显减小,有利于提高触头的工作性能。

带铁心横磁-纵磁触头结构的优化设计

触头作为真空灭弧室的核心元件,其灭弧能力会直接影响直流开断过程。该文通过有限元仿真软件建立了三种触头模型,计算了高频电流下触头产生的磁场分布。电流峰值时的触头间隙中心可产生约为21 mT的纵向磁场,横向磁感应强度约为71 mT,纵向磁场分布不均匀。为了进一步提高触头间隙磁场强度以及分布均匀度,在触头模型中增加铁心及改变铁心结构来提升触头产生的磁场强度,基于BP神经网络与智能优化算法联合的方法对触头模型进行优化设计。优化结果显示:当触头的结构参数外触头非径向开槽夹角α为31.8°、外触头内外半径差值Δ为8.3 mm、内触头片半径r为15.2 mm、外触头杯斜槽高度h为16.1 mm、铁心结构开槽宽度d为1.1 mm时,触头间隙中心产生了74.99 mT的横向磁场;电流峰值时刻的触头间隙中心可产生44.02 mT的纵向磁场,不均匀度从优化前的7.44减小到4.67,均匀度得到了较大提升,提高了磁场对真空电弧的调控能力。

基于MOPSO算法的超导限流器结构参数优化

电阻型超导限流器能够快速限制短路电流,因此常与直流断路器结合使用开断直流故障。超导限流器的性能与直流断路器元件参数之间存在复杂耦合关系,在一定直流断路器元件参数下的超导限流器的选型亟需研究。文中首先分析了现有超导限流器电阻的模型,然后仿真了超导限流器与直流断路器结合使用时的短路故障,分析了超导限流器电阻和回路电流的变化规律。仿真结果表明:超导限流器可成功限制故障电流的上升,帮助直流断路器开断故障电流;超导限流器的电阻、温度和电流波形之间存在复杂耦合关系。最后,固定超导带材的截面,通过多目标粒子群算法对超导限流器的长度进行了优化,优化前后的结果表明:当超导带材长度为47 m时,短路电流峰值为1.24 kA,在5.90 ms时产生电流过零点,比优化前超导带材减少了7 m,但短路电流峰值和过零点时间几乎没有变化。

电流频率对真空断路器开断能力影响的仿真分析

随着风电等新能源以及直流电网的发展,断路器开断电流的频率呈现出多样化,要求断路器可以开断高于或者低于50 Hz的电流。针对此问题,文中试图从燃弧过程、磁场调控以及弧后过程3个方面去研究电流频率对真空断路器开断能力的影响。文中首先研究了不同频率下的电弧微观参数分布,发现随着频率的增加,电弧形态越呈现出集聚的现象,触头呈现出局部烧蚀严重的现象,但是由于燃弧时间变短,触头总的烧蚀变小。频率越低,燃弧时间越长,触头则呈现出严重的烧蚀。然后研究了不同频率下常用杯状纵磁触头的磁场分布,发现随着频率的增加,磁场分布越不均匀,对电弧等离子体的扩散作用变小,并且由于燃弧时间的缩短,等离子体更不易扩散。最后通过频率对弧后鞘层生长过程的影响分析发现,频率越大,弧后鞘层生长到满开距越慢,从而降低开断能力。文中得出:低频下的断路器触头整体烧蚀严重,电弧熄弧的时候将产生大量的金属蒸气,金属蒸气的衰减过程将主导断路器的弧后绝缘恢复过程,而高频下的断路器的弧后绝缘恢复过程则由鞘层生长过程主导。

Mesenchymal stromal cells modulate unfolded protein response and preserve β-cell mass in type 1 diabetes

Introduction:Transplantation of mesenchymal stromal cells(MSCs)is a promising therapy for type 1 diabetes(T1D).However,whether the infused MSCs affect the endoplasmic reticulum stress or subsequent unfolded protein response inβcells remains unclear.Methods:To investigate this,we induced early-onset T1D in non-obese diabetic mice using streptozotocin.Subsequently,T1D mice were randomly assigned to receive either MSCs or phosphate-buffered saline.We observed the in vivo homing of MSCs and assessed their effectiveness by analyzing blood glucose levels,body weight,histopathology,pancreatic protein expression,and serum levels of cytokines,proinsulin,and C-peptide.Results:Infused MSCs were found in the lungs,liver,spleen,and pancreas of T1D mice.They exhibited various effects,including reducing blood glucose levels,regulating immunity,inhibiting inflammation,increasingβ-cell areas,and reducing the expression of key proteins in the unfolded protein response pathway.Fasting serum proinsulin and C-peptide levels were significantly higher in the MSCs treatment group than in the T1D model group.However,there was no significant difference in the biomarker ofβ-cell endoplasmic reticulum stress,the ratio of fasting serum proinsulin to C-peptide,between the two groups.Conclusion:Ourfindings reveal that MSCs infusion does not alleviate endoplasmic reticulum stress inβcells directly but modulates the unfolded protein response pathway to preserveβ-cell mass and function in T1D mice.

Rydberg-Induced Topological Solitons in Three-Dimensional Rotation Spin–Orbit-Coupled Bose–Einstein Condensates

We present a novel approach for generating stable three-dimensional(3D)spatiotemporal solitons(SSs)within a rotating Bose–Einstein condensate,incorporating spin–orbit coupling(SOC),a weakly anharmonic potential and cold Rydberg atoms.This intricate system facilitates the emergence of quasi-stable 3D SSs with topological charges|m|≤3 in two spinor components,potentially exhibiting diverse spatial configurations.Our findings reveal that the Rydberg long-range interaction,spin–orbit coupling,and rotational angular frequency exert significant influence on the domains of existence and stability of these solitons.Notably,the Rydberg interaction contributes to a reduction in the norm of topological solitons,while the SOC plays a key role in stabilizing the SSs with finite topological charges.This research of SSs exhibits potential applications in precision measurement,quantum information processing,and other advanced technologies.

BEV-radar:毫米波雷达-相机双向融合的三维目标检测

在自动驾驶场景下的3D目标检测任务中,探索毫米波雷达数据作为RGB图像输入的补充正成为多模态融合的新兴趋势。然而,现有的毫米波雷达-相机融合方法高度依赖于相机的一阶段检测结果,导致整体性能不够理想。本文提供了一种不依赖于相机检测结果的鸟瞰图下双向融合方法(BEV-radar)。对于来自不同域的两个模态的特征,BEV-radar设计了一个双向的基于注意力的融合策略。具体地,以基于BEV的3D目标检测方法为基础,我们的方法使用双向转换器嵌入来自两种模态的信息,并根据后续的卷积块强制执行局部空间关系。嵌入特征后,BEV特征在3D对象预测头中解码。我们在nu Scenes数据集上评估了我们的方法,实现了48.2 m AP和57.6 NDS。结果显示,与仅使用相机的基础模型相比,不仅在精度上有所提升,特别地,速度预测误差项有了相当大的改进。代码开源于https://github.com/Etah0409/BEV-Radar。

Hemolysis attributed to high dose vitamin C:Two case reports

BACKGROUND High-dose vitamin C treatment(HVCT)can reduce the adverse effect of chemotherapy and enhance the effect of antitumor therapy,which has been considered one of the safest alternative treatments.However,the severity of its adverse effects may have been underestimated.The most serious adverse effect is hemolysis,which may result in acute kidney injury or death.Although glucose-6-phosphate dehydrogenase(G6PD)deficiency is considered to be the main cause,the probability and pathological mechanism are not completely understood,leading to a lack of effective and standardized treatment methods.CASE SUMMARY Two patients with colorectal cancer developed hemolytic anemia after using 1 g/kg HVCT.In contrast to previous cases,the lowest hemoglobin level in the two cases was<50 g/L,which was lower than previously reported.This may be because Case 1 had chronic hepatitis B for many years,which caused abnormal liver reserve function,and Case 2 had grade II bone marrow suppression.Both patients improved and were discharged after blood replacement therapy.Our cases had the most severe degree of hemolysis but the best prognosis,suggesting that our treatment may be helpful for rescue of drug-induced hemolysis.This is the first review of the literature on hemolysis caused by HVCT,and we found that all patients with G6PD deficiency developed hemolysis after HVCT.CONCLUSION G6PD deficiency should be considered as a contraindication to HVCT,and it is not recommended for patients with bone marrow suppression,moderate-tosevere anemia,hematopoietic abnormalities,or abnormal liver and kidney function.Early blood purification and steroid therapy may avoid acute kidney injury or death caused by HVCT-related hemolytic anemia.

Coordinated Voltage Control of Distribution Network ConsideringMultiple Types of Electric Vehicles

The couple between the power network and the transportation network(TN)is deepening gradually with the increasing penetration rate of electric vehicles(EV),which also poses a great challenge to the traditional voltage control scheme.In this paper,we propose a coordinated voltage control strategy for the active distribution networks considering multiple types of EV.In the first stage,the action of on-load tap changer and capacitor banks,etc.,are determined by optimal power flow calculation,and the node electricity price is also determined based on dynamic time-of-use tariff mechanism.In the second stage,multiple operating scenarios of multiple types of EVs such as cabs,private cars and buses are considered,and the scheduling results of each EV are solved by building an optimization model based on constraints such as queuing theory,Floyd-Warshall algorithm and traffic flow information.In the third stage,the output power of photovoltaic and energy storage systems is fine-tuned in the normal control mode.The charging power of EVs is also regulated in the emergency control mode to reduce the voltage deviation,and the amount of regulation is calculated based on the fair voltage control mode of EVs.Finally,we test the modified IEEE 33-bus distribution system coupled with the 24-bus Beijing TN.The simulation results show that the proposed scheme can mitigate voltage violations well.

Regulation of TMEM100 expression by epigenetic modification,effects on proliferation and invasion of esophageal squamous carcinoma

BACKGROUND Esophageal squamous cell carcinoma(ESCC)is a prevalent malignancy with a high morbidity and mortality rate.TMEM100 has been shown to be suppressor gene in a variety of tumors,but there are no reports on the role of TMEM100 in esophageal cancer(EC).AIM To investigate epigenetic regulation of TMEM100 expression in ESCC and the effect of TMEM100 on ESCC proliferation and invasion.METHODS Firstly,we found the expression of TMEM100 in EC through The Cancer Genome Atlas database.The correlation between TMEM100 gene expression and the survival of patients with EC was further confirmed through Kaplan-Meier analysis.We then added the demethylating agent 5-AZA to ESCC cell lines to explore the regulation of TMEM100 expression by epigenetic modification.To observe the effect of TMEM100 expression on tumor proliferation and invasion by overexpressing TMEM100.Finally,we performed gene set enrichment analysis using the Kyoto Encyclopaedia of Genes and Genomes Orthology-Based Annotation System database to look for pathways that might be affected by TMEM100 and verified the effect of TMEM100 expression on the mitogen-activated protein kinases(MAPK)pathway.RESULTS In the present study,by bioinformatic analysis we found that TMEM100 was lowly expressed in EC patients compared to normal subjects.Kaplan-meier survival analysis showed that low expression of TMEM100 was associated with poor prognosis in patients with EC.Then,we found that the demethylating agent 5-AZA resulted in increased expression of TMEM100 in ESCC cells[quantitative real-time PCR(qRT-PCR)and western blotting].Subsequently,we confirmed that overexpression of TMEM100 leads to its increased expression in ESCC cells(qRT-PCR and western blotting).Overexpression of TMEM100 also inhibited proliferation,invasion and migration of ESCC cells(cell counting kit-8 and clone formation assays).Next,by enrichment analysis,we found that the gene set was significantly enriched in the MAPK signaling pathway.The involvement of TMEM100 in the regulation of MAPK signaling pathway in ESCC cell was subsequently verified by western blotting.CONCLUSION TMEM100 is a suppressor gene in ESCC,and its low expression may lead to aberrant activation of the MAPK pathway.Promoter methylation may play a key role in regulating TMEM100 expression.

Investigation on the Current Status and Effects of Online Course Learning for Nursing Students

[Objectives]To explore the current situation and effects of online learning from the perspective of students,as well as the learning dynamics,and to explore the online teaching methods.It is possible to put forward relevant suggestions for the problems presented by online teaching,find effective teaching methods,and explore appropriate online teaching methods.[Methods]The nursing students of the 2020,2021,and 2022 grades of Chengde Nursing Vocational College were selected as the research subjects.A self-made questionnaire survey method was adopted.The questionnaire had 5 items and 44 questions:3 questions on personal information,9 questions on the teacher level,12 ques-tions on the student level,7 questions on the technical level,and 13 questions on online learning satisfaction.[Results]In the process of on-line teaching,the cooperation between family and school can be carried out to give full play to the important role of family supervision in online learning and other education,which is conducive to maintaining the discipline of online courses on the Internet,increasing the online learning effect of students,and avoiding the temptation of the Internet to the greatest extent.In the process,we should increase students'self-control in online learning,help students shape realistic goals,and thus improve the effect of online learning.Technical level:increase information-based teaching,enrich teaching content,and introduce virtual simulation software to simulate clinical operations,so as to increase students’interest and enthusiasm in learning.[Conclusions]This study is expected to provide a certain reference for the smooth and efficient development of online teaching and online learning skills.

Research Progress on Epigenetic Mechanism of Sarcopenia

In recent years, sarcopenia, as a progressive muscular atrophy and weakness, has become one of the common diseases in the elderly. Although its cause is not fully understood, a growing body of research suggests that epigenetic mechanisms play an important role in the pathogenesis of sarcopenia. The purpose of this review is to summarize the current research progress in the epigenetics of sarcopenia, focusing on the role of DNA methylation, RNA methylation and non-coding RNA in the pathogenesis of sarcopenia. While exploring the epigenetic mechanism of sarcopenia, this study will also look into the application prospect of epigenetics in the treatment strategy of sarcopenia, which will provide new ideas and directions for the treatment of sarcopenia.

Cultivation Path of Nursing Undergraduates’Scientific Research and Innovation Ability

Objective: The cultivation of the innovation ability and scientific research is one of the nursing learning objectives for undergraduate students. To explore the method and effect of training system of scientific research innovation ability of nursing undergraduates based on “3332”. Methods: Three course learning modules are constructed: stage-based course learning module, systematic project practice training module and comprehensive practice training module. A practical training platform for scientific research innovation projects is built, and undergraduate scientific research innovation ability training is carried out from both in-class and out-of-class lines. Results: Since 2017, the students have obtained 7 national innovation and entrepreneurship training programs, 52 university-level undergraduate scientific research projects, published more than 10 academic papers, and obtained 2 patent authorization. Conclusions: The training system of scientific research innovation ability of nursing undergraduates based on “3332” is conducive to the development of scientific research innovation ability of nursing students, and to cultivate nursing talents who can adapt to the development of the new era and have better post competence.

正上方轻量加卸载时双圆盾构隧道变形监测与整治分析

软土地区运营轨道交通因上方轻量加卸载作用而产生的变形问题,在工程领域受到广泛关注。上海某道路工程跨越地铁双圆盾构区间,且该项目涉及河道改道施工,故隧道上部存在复杂的轻量加卸载作用。通过对该下卧软土双圆盾构隧道的变形监测,分析了轻量加卸载作用对运营盾构隧道的影响,并针对河道改道区段进行重点分析,总结出了产生沉降漏斗的主要原因;随后,结合现场监测数据和沉降原因,对重点区域的路面结构进行了整治。监测结果表明:基于监测数据采取的重点整治技术措施治理效果明显,对于轻量加卸载作用下双圆盾构隧道运营安全保护具有重要的工程实践价值。

软土地层中水平冻结施工对上方运营地铁车站影响监测分析

为研究近接隧道水平冻结对上部运营车站冻胀变形的规律,以上海市18号线国权路站在建隧道下穿10号线上部运营车站冻结法施工为工程背景,通过监测数据分析研究冻结温度和车站沉降变形规律。分析结果表明:土体温度随着冻结天数增加,先急后缓地下降,并于50 d后低于-10℃,在隧道周围形成2 m厚的冻结壁。随着冻结程度的增强,冻结中心区域冻胀变形显著,其中侧墙初始沉降为2 mm,后持续增加到5 mm,并保持稳定;车站道床初始隆起为3 mm,后增加到10 mm,并达到稳定状态;车站立柱初始隆起为5 mm,后显著增加到23 mm,后期保持稳定。

真空拉弧起始收缩过程实验研究

真空电弧的形态分布主导燃弧阶段等离子体分布特性,起始收缩过程的等离子体分布对成功开断有重要影响。为了研究机构运动过程中真空电弧的起始收缩特性,分析燃弧工况对收缩持续时间的影响,文中以10 kV可拆真空灭弧室为载体,建立真空电弧工频开断实验平台及电弧形态观测系统,通过改变灭弧室参数,结合电弧图像数字处理技术,对真空拉弧起始收缩时间进行定量分析。结果表明:起始收缩电弧的持续时间基本与电流幅值和起弧电流呈较明显正相关,与机构分闸速度呈负相关。纵向磁场对中心弧柱和边缘区域作用相反,文中利于扩散的临界磁场为60 mT,当纵向磁场小于60 mT时,收缩态电弧趋向扩散;纵向磁场大于60 mT时,收缩态持续时间增大。

Cultivation Path of Nursing Undergraduates’ Scientific Research and Innovation Ability

Objective:The cultivation of the innovation ability and scientific research is one of the nursing learning objectives for undergraduate students.To explore the method and effect of training system of scientific research innovation ability of nursing undergraduates based on“3332”.Methods:Three course learning modules are constructed:stage-based course learning module,systematic project practice training module and comprehensive practice training module.A practical training platform for scientific research innovation projects is built,and undergraduate scientific research innovation ability training is carried out from both in-class and out-of-class lines.Results:Since 2017,the students have obtained 7 national innovation and entrepreneurship training programs,52 university-level undergraduate scientific research projects,published more than 10 academic papers,and obtained 2 patent authorization.Conclusions:The training system of scientific research innovation ability of nursing undergraduates based on“3332”is conducive to the development of scientific research innovation ability of nursing students,and to cultivate nursing talents who can adapt to the development of the new era and have better post competence.

一种带自充电支路的改进型混合直流断路器

直流断路器作为柔性直流电网的关键设备,对直流输配电网的安全、稳定运行有着重要的意义。针对带限流能力的直流断路器存在的造价偏高、故障清除速度慢等问题,提出了一种带自充电支路的改进型混合直流断路器(improved hybrid DC circuit breaker with self-charging branch,SCB-IHDCCB)拓扑,设置限流电感旁路和接地旁路,优化自充电支路路线,将泄能支路与自充电支路结合使用,在保证断路器性能的前提下,减少了支路数量,大大降低了晶闸管等元器件数量,从而大大降低其造价。对所提拓扑在单端系统中的工况进行了理论推导与分析,基于所提拓扑设计了500kV的单端直流系统,在PSCAD/EMTDC中建立模型进行了仿真验证,并与其他拓扑方案的性能、元器件数量进行比较。仿真结果表明,SCB-IHDCCB的性能和造价都得到较大优化,具有良好的经济性和应用前景。